Generac Power Systems MAC1.2G Owner's manual

Brand: Generac Power Systems

Model: MAC1.2G

Type: Owner's manual

SAVE THIS MANUAL FOR FUTURE REFERENCE

MAC1.2G

Indirect Fired Heater

Owner’s Manual

MODEL NUMBER: _________________________

SERIAL NUMBER: _________________________

DATE PURCHASED:________________________

ii Owner’s Manual for Indirect Fired Air Heater

(000393a)

WARNING

CANCER AND REPRODUCTIVE HARM

www.P65Warnings.ca.gov.

(000394)

WARNING

Breathing diesel engine exhaust exposes you

to chemicals known to the State of California

to cause cancer and birth defects or other

reproductive harm.

• Always start and operate the engine in a

well-ventilated area.

• If in an enclosed area, vent the exhaust to

the outside.

• Do not modify or tamper with the exhaust

system.

• Do not idle the engine except as necessary.

For more information go to

www.P65Warnings.ca.gov/diesel.

Owner’s Manual for Indirect Fired Heater iii

Table of Contents

Section 1: Introduction and Safety

Introduction ..................................................................1

Read This Manual Thoroughly ....................................1

Intended Applications .................................................1

Safety Rules .................................................................1

How to Obtain Service .................................................2

General Hazards ...........................................................2

Explosion and Fire Hazards ........................................2

Trailer Hazards .............................................................3

Battery Hazards ............................................................3

Service Safety ..............................................................4

Towing Safety ...............................................................4

Hitch and Coupling ......................................................4

Running Lights ............................................................4

Safe Towing Techniques .............................................4

Reporting Trailer Safety Defects ................................4

Safety and Operating Decals ......................................5

Section 2: General Information

Specifications ...............................................................7

Engine Component Locations ....................................8

External Components ..................................................9

Heater Components ...................................................10

Emissions ...................................................................11

Engine Oil Recommendations ..................................11

Coolant Recommendation ........................................11

Fuel System ................................................................11

Trailer Towing Guidelines .........................................11

Wheel Chock Guidelines ...........................................12

Control Panel ..............................................................12

Section 3: Operation

Before Starting Engine ..............................................13

Pre-start Checklist .....................................................13

Engine Oil Level Check .............................................13

Engine Coolant Check ...............................................13

Ducting Guidelines ....................................................13

Engine and Heater Startup ........................................14

Adjusting Heater Output ...........................................14

Engine and Heater Shutdown ...................................15

Thermostat .................................................................15

Changing Temperature Units ....................................15

Thermostat Control ....................................................15

Section 4: Maintenance

Maintenance ...............................................................17

Maintenance Tasks ....................................................17

Daily Walk Around Inspection ...................................17

Draining and Refilling the Oil .....................................17

Adding Coolant ..........................................................17

Maintenance Schedule ..............................................18

Engine Maintenance Schedule .................................19

Battery Inspection ......................................................20

Battery Installation and Replacement ........................20

Other Maintenance Checks .......................................21

Trailer Maintenance ...................................................21

Short Term Storage ...................................................21

Return to Service .......................................................21

Section 5: Troubleshooting

General Troubleshooting Guide ...............................23

Section 6: Service Log

iv Owner’s Manual for Indirect Fired Heater

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Owner’s Manual for Indirect Fired Heater 1

Introduction and Safety

Section 1: Introduction and Safety

Introduction

Thank you for purchasing a Generac Mobile Products

LLC product. This unit has been designed to provide

high-performance, efficient operation, and years of qual-

ity use when maintained properly.

The MAC1.2G indirect fired heater is designed and built

for sustained, reliable heat production in industrial oper-

ating conditions and environments. The MAC1.2G is built

to withstand frequent handling under these conditions.

The unit is mounted on a trailer that has forklift access

and chain attach points on both sides. The fully enclosed

design protects the operating components, allowing all-

weather storage and operations.

The information in this manual is accurate based on

products produced at the time of publication. The manu-

facturer reserves the right to make technical updates,

corrections, and product revisions at any time without

notice.

Read This Manual Thoroughly

If any section of the manual is not understood, contact

your nearest Generac Mobile Products (GMP) Autho-

rized Service Dealer (ASD), or contact Generac Mobile

Products Customer Service at 800-926-9768, or visit

www.generacmobileproducts.com with any questions

or concerns.

The owner is responsible for proper maintenance and

safe use of the unit. The manufacturer strongly recom-

mends that all users read the owner’s manual and thor-

oughly understand all instructions before using this unit.

The manufacturer also strongly recommends instructing

other users to properly start and operate the unit. This

prepares them if they need to operate the unit in an

emergency.

SAVE THESE INSTRUCTIONS for future reference. This

manual contains important instructions for the unit that

should be followed during placement, operation, and

maintenance of the unit and its components. Always sup-

ply this manual to any individual that will use this unit.

Intended Applications

The machine is designed for industrial use. Examples of

intended applications include, but are not limited to:

• Gas and oil exploration

• Utilities and power plants

• Mining

• Construction

• Agricultural applications

• Employee locker areas and housing

• Emergency thawing

• Pre-warming of equipment and motors

• Offshore drilling rigs

• Painting and coating locations

• Airline hanger heat

• Dehumidification

Using this machine for applications other than its

intended purpose may void the warranty. Examples of

misuse include, but are not limited to, using the machine:

• To transport persons or equipment.

• As a tow vehicle.

• As a ladder or work surface.

• During extreme weather.

• Indoors.

• If it is incorrectly serviced or maintained.

Safety Rules

The manufacturer cannot anticipate every possible cir-

cumstance that might involve a hazard. The alerts in this

manual, and on tags and decals affixed to the unit, are

not all inclusive. If using a procedure, work method, or

operating technique that the manufacturer does not spe-

cifically recommend, verify that it is safe for others and

does not render the equipment unsafe.

Throughout this publication, and on tags and decals

affixed to the unit, DANGER, WARNING, CAUTION, and

NOTE blocks are used to alert personnel to special

instructions about a particular operation that may be haz-

ardous if performed incorrectly or carelessly. Observe

them carefully. Alert definitions are as follows:

(000100a)

WARNING

Consult Manual. Read and understand manual

completely before using product. Failure to

completely understand manual and product

could result in death or serious injury.

(000001)

DANGER

Indicates a hazardous situation which, if not avoided,

will result in death or serious injury.

(000002)

WARNING

Indicates a hazardous situation which, if not avoided,

could result in death or serious injury.

2 Owner’s Manual for Indirect Fired Heater

Introduction and Safety

NOTE: Notes contain additional information important to

a procedure and will be found within the regular text of

this manual.

These safety alerts cannot eliminate the hazards that

they indicate. Common sense and strict compliance with

the special instructions while performing the action or

service are essential to preventing accidents.

How to Obtain Service

When the unit requires servicing or repairs, contact a

GMP ASD for assistance. Service technicians are fac-

tory-trained and are capable of handling all service

needs. For assistance locating a dealer, go to https://

www.generacmobileproducts.com/parts-service/find-

service.

When contacting a GMP ASD about parts and service,

always supply the complete model and serial number of

the unit as given on the data decal located on the unit.

Record the model and serial numbers in the spaces pro-

vided on the front cover of this manual.

General Hazards

Explosion and Fire Hazards

(000003)

CAUTION

Indicates a hazardous situation which, if not avoided,

could result in minor or moderate injury.

Asphyxiation. Running engines produce

carbon monoxide, a colorless, odorless,

poisonous gas. Carbon monoxide, if not

avoided, will result in death or serious injury.

(000103)

DANGER

Personal injury. Do not operate unit during transport.

Doing so could result in death, serious injury, or

property damage.

(000231a)

WARNING

(000111)

WARNING

Moving Parts. Keep clothing, hair, and

appendages away from moving parts. Failure

to do so could result in death or serious injury.

CAUTION

(000291)

Equipment damage. Do not attempt to start or operate

a unit in need of repair or scheduled maintenance.

Doing so could result in serious injury, death, or

equipment failure or damage.

WARNING

(000108)

WARNING

Hot Surfaces. When operating machine, do not

touch hot surfaces. Keep machine away from

combustibles during use. Hot surfaces could

result in severe burns or fire.

(000107)

WARNING

Hearing Loss. Hearing protection is

recommended when using this machine.

Failure to wear hearing protection could

result in permanant hearing loss.

CAUTION

(000229)

Equipment or property damage. Do not block air

intake or restrict proper air flow. Doing so could

result in unsafe operation or damage to unit.

CAUTION

(000240a)

Unit damage. Do not stop engine before heating

unit is cooled. Doing so could result in unit damage.

(000105)

DANGER

Explosion and Fire. Fuel and vapors are

extremely flammable and explosive. Add fuel

in a well ventilated area. Keep fire and spark

away. Failure to do so will result in death

or serious injury.

(000214)

DANGER

Explosion and Fire. Do not fill fuel tank past full line.

Allow for fuel expansion. Overfilling may cause fuel

to spill onto engine causing fire or explosion, which

will result in death or serious injury.

Owner’s Manual for Indirect Fired Heater 3

Introduction and Safety

Trailer Hazards

Battery Hazards

Always recycle batteries in accordance with local laws

and regulations. Contact your local solid waste collection

site or recycling facility to obtain information on local

recycling processes. For more information on battery

recycling, visit the Battery Council International website

at: http://batterycouncil.org

(000143)

DANGER

Explosion and Fire. Fuel and vapors are extremely

flammable and explosive. Store fuel in a well

ventilated area. Keep fire and spark away. Failure

to do so will result in death or serious injury.

(000147)

WARNING

Risk of Fire. Unit must be positioned in a

manner that prevents combustible material

accumulation underneath. Failure to do so

could result in death or serious injury.

WARNING

Fire risk. Fuel and vapors are extremely

flammable. Do not operate indoors. Doing so

could result in death, serious injury, or

property or equipment damage.

(000281)

WARNING

Explosion and fire risk. Do not smoke near unit.

Keep fire and spark away. Failure to do so could

result in death, serious injury, or property or

equipment damage.

(000282)

WARNING

Personal injury. Trailer must be securely coupled to

the hitch with the chains correctly attached. Uncoupled

or unchained towing could result in death or serious

injury.

(000233a)

(000234a)

WARNING

Crushing hazard. Verify unit is properly secured and

on level ground. An unsecured unit can suddenly roll

or move, causing death or serious injury.

WARNING

Property or Equipment Damage. Tighten wheel lug

nuts after first 50 miles to factory specifications.

Failure to do so could result in death, serious injury,

property or equipment damage.

(000235)

WARNING

Rollover hazard. Unit must be placed on flat, level

ground to prevent tipping or rollover. Failure to do so

could result in death, serious injury, or property or

equipment damage.

(000283)

WARNING

Property or equipment damage. Do not alter the trailer.

Alterations can damage essential safety items. Doing

so could result in death, serious injury, or property or

equipment damage.

(000285)

(000162)

WARNING

Explosion. Do not dispose of batteries in a fire. Batteries

are explosive. Electrolyte solution can cause burns and

blindness. If electrolyte contacts skin or eyes, flush with water

and seek immediate medical attention.

(000163a)

WARNING

Risk of burn. Do not open or mutilate batteries.

Batteries contain electrolyte solution which can

cause burns and blindness. If electrolyte contacts

skin or eyes, flush with water and seek immediate

medical attention.

(000130)

WARNING

Accidental Start-up. Disconnect the negative battery

cable, then the positive battery cable when working

on unit. Failure to do so could result in death

or serious injury.

(000181)

WARNING

Vision Loss. Eye protection is required to avoid

spray from spark plug hole when cranking engine.

Failure to do so could result in vision loss.

WARNING

Environmental Hazard. Always recycle batteries at an

official recycling center in accordance with all local

laws and regulations. Failure to do so could result in

environmental damage, death or serious injury.

(000228)

4 Owner’s Manual for Indirect Fired Heater

Introduction and Safety

Service Safety

• DO NOT perform even routine service (oil/filter

changes, cleaning, etc.) unless all electrical com-

ponents are shut down.

• Replace all missing and hard to read decals.

Decals provide important operating instructions

and warn of dangers and hazards.

Towing Safety

Towing a trailer requires care. The trailer and vehicle

must be in good condition and securely fastened to each

other to reduce the possibility of an accident. Some

states require that large trailers be registered and

licensed. Contact your local Department of Transporta-

tion (DOT) office to verify license requirements for your

particular unit.

Hitch and Coupling

•

Verify the hitch and coupling on the towing vehicle

are rated equal to, or greater than, the trailer’s

Gross Vehicle Weight Rating (GVWR).

• Verify the trailer hitch and the coupling are compat-

ible. Verify the coupling is securely fastened to the

vehicle.

• DO NOT tow the trailer using defective parts.

Inspect the hitch and coupling for wear or damage

before every tow.

• To eliminate squeaking, wipe the coupler clean and

apply fresh grease each time the trailer is towed.

• Connect safety chains in a crossing pattern under

the tongue.

• Before towing the trailer, verify that the weight of

the trailer is equal across all tires. On trailers with

adjustable height hitches, adjust the angle of the

trailer tongue to keep the trailer as level as possi-

ble.

• Verify all access doors on the trailer are closed and

locked.

Running Lights

•

Verify directional and brake lights on trailer are

connected and working properly.

Safe Towing Techniques

•

Practice turning, stopping, and backing up in an

area away from heavy traffic prior to transporting

the unit.

• Maximum recommended speed for highway towing

is 45 mph (72 km/h). Recommended off-road tow-

ing speed is 10 mph (16 km/h) or less, depending

on terrain.

• When towing, maintain extra space between vehi-

cles and avoid soft shoulders, curbs, and sudden

lane changes.

• Reduce speed before curves, and maintain speed

throughout the curve.

• Reduce speed before going over bumps or holes.

Keep your foot off the accelerator while going over

bumps or holes.

Reporting Trailer Safety Defects

If you believe your trailer has a defect which could cause

a crash, injury, or death, you should immediately inform

the National Highway Traffic Safety Administration

(NHTSA) in addition to notifying Generac Mobile Prod-

ucts, LLC.

If NHTSA receives similar complaints, it may open an

investigation. If it finds that a safety defect exists in a

group of vehicles, it may order a recall and remedy cam-

paign. However, NHTSA cannot become involved in an

individual problem between you, your dealer, or Generac

Mobile Products, LLC.

To contact NHTSA, you may either call the Auto Safety

Hotline toll-free at 1-888-327-4236 (TTY:1-800-424-

9153), go to http://www.safercar.gov; or write to:

Administrator

NHTSA

1200 New Jersey Avenue S.E.

Washington, DC 20590

You can also obtain other information about motor vehi-

cle safety from http://www.safercar.gov.

CAUTION

(000419)

Personal injury. Wear appropriate personal protective

equipment at all times while operating and servicing

unit. Failure to do so could result in personal injury.

Owner’s Manual for Indirect Fired Heater 5

Introduction and Safety

Safety and Operating Decals

See Figure 1-1. This unit features numerous safety and

operating decals. These decals provide important operat-

ing instructions and warn of dangers and hazards. The

following diagrams illustrate decal locations and descrip-

tions. Replace any missing or hard-to-read decals and

use care when washing and cleaning the unit. Decal part

numbers can be found in the unit parts manual at

www.generacmobileproducts.com.

Figure 1-1. Safety and Operating Decal Locations

Item No. Label Description Item No. Label Description

No fuel additives. Low or ultra low sulfur diesel

fuel only

5 Caution: Rotating assembly

Warning: Fire from flammable fuel can cause

serious injury or death. No smoking, sparks, or

open flame during fueling or wash-down

6 Danger: Moving parts can cut or crush

3 Warning: Wheel lugnuts may become loose 7 Warning: Hot surfaces

4 Trailer identification information

008975

6 Owner’s Manual for Indirect Fired Heater

Introduction and Safety

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Owner’s Manual for Indirect Fired Heater 7

General Information

Section 2: General Information

Specifications

Heater 1,200,000 BTU/hour (351.69 kW/hour) maximum

Type Indirect fired

Power ISUZU 3CE1 Tier 4 Final diesel, 23.4 HP (17.4 kW)

Operating Speed 1,800 rpm

Engine Controls/Display LOFA, keyed ignition switch

Air Volume

6,500 CFM (11,044 m

/hour)

Battery Standard: 575 CCA (115 CCA Reserve)

Cold Weather Package: EON dry cell, 1150 CCA

Static Pressure 3 in H

Air Outlet 1 x 20 in (50.8 cm)

Electrical 12V

Engine Fuel Diesel

Engine Fuel Capacity USA — 270 gal (1022 L)

Engine Oil Capacity 7.1 qt (6.7 L)

Engine Coolant Capacity 2.1 qt (2 L)

Engine Fuel Rate (at 100% prime) 1.25 gph (4.76 Lph)

Burner Fuel Rate (at 100% prime) 10.18 gph (38.5 Lph)

Run Time 33.8 hours

Temperature Rise 180 °F (82 °C)

Fan Class 2, SWSI, 222 BC

Hitch Type Electric, 2-5/16 in ball coupler

Duct Diameter 1 x 20 in (50.8 cm)

Estimated Heater Efficiency 85%

Dimensions 255 in x 96 in x 102 in (6.5 m x 2.4 m x 2.6 m)

Weight Dry: 8,265 lbs (3,749 kg)

Operating: 10,280 lbs (4,663 kg)

Burner Riello RL38/M

Generator Marathon 282PSL1704

8 Owner’s Manual for Indirect Fired Heater

General Information

Engine Component Locations

Figure 2-1. Engine Components

A Battery (not shown) H Engine oil drain value

B Coolant sub-tank (not shown) I Engine oil drain hose

C Radiator fill cap J Engine oil dipstick

D Engine air cleaner assembly K Engine fuel filter

E Engine fan L Water separator assembly

F Engine oil fill M Engine fuel pump

G Engine oil filter N Generator

008977

Owner’s Manual for Indirect Fired Heater 9

General Information

External Components

Figure 2-2. External Components

A Burner exhaust I Oil drain hose (not shown)

B Reflector J Trailer support jack

C Rear support jack K Trailer hitch

D D-ring L Engine exhaust

E Reflector tape M Fuel fill

F Fork lift pockets N Air inlet panel

G Power receptacle O Air outlet

H Engine access panel

008975

10 Owner’s Manual for Indirect Fired Heater

General Information

Heater Components

Figure 2-3. Heater Components

A Outlet temp thermostat D Inspection window

B Burner temp thermostat E Diesel fired burner

C Electrical control box

008976

Owner’s Manual for Indirect Fired Heater 11

General Information

Emissions

The United States Environmental Protection Agency (US

EPA) (and California Air Resources Board (CARB), for

engines/equipment certified to California standards)

requires that this engine/equipment complies with

exhaust and evaporative emissions standards. Locate

the emissions compliance decal on the engine to deter-

mine applicable standards. For emissions warranty infor-

mation, please reference the included emissions

warranty. It is important to follow the maintenance specifi-

cations in the manual to ensure that the engine complies

with the applicable emissions standards for the duration

of the product’s life.

Engine Oil Recommendations

Change oil and oil filter at least once every 12 months,

even if the hours of operation are fewer than the other-

wise recommended service interval. See the applicable

engine manual for recommended oil types. Use only

approved oil types.

For more information, see the engine manual.

Coolant Recommendation

Use demineralized or distilled water for best results. Hard

water causes scale deposits, which reduces cooling effi-

ciency and raises internal temperatures, possibly leading

to engine damage.

See the engine manual for recommended coolants.

Use a Long Life Coolant Antifreeze or Extended Life

Coolant that meets or exceeds these specifications:

• Isuzu Part Number 8-12346-290-0

• ASTM D4985

See the engine manual for recommended coolants.

Test coolant yearly, or every 1,000 hours, whichever

comes first.

For more information, see the engine manual.

Fuel System

The heater is designed to operate with diesel fuel.

IMPORTANT NOTE: Comply with all laws regulating

the storage, handling, and transporting of fuels.

Follow these guidelines:

• Use only ultra-low-sulfur diesel fuel.

• When temperatures are at or below freezing, use

No. 1D diesel fuel.

• When temperatures are above freezing, use No.

2D diesel fuel.

• In some areas of the country, climatized fuel—a

mixture of 1D and 2D—may also be used.

For more information, see the engine manual.

Trailer Towing Guidelines

(000149)

DANGER

Risk of poisoning. Do not use mouth to siphon

coolant. Doing so will result in death or serious

injury.

CAUTION

(000323)

Engine damage. Use approved coolant only.

Failure to do so could result in equipment damage.

(000168)

DANGER

Explosion and Fire. Fuel and vapors are

extremely flammable and explosive. Keep fire

and spark away. Failure to do so will result

in death or serious injury.

(000204)

DANGER

Explosion and Fire. Do not overfill fuel tank.

Overfilling may cause fuel to leak and ignite

or explode, resulting in death or serious injury.

WARNING

Personal injury. Trailer must be securely coupled to

the hitch with the chains correctly attached. Uncoupled

or unchained towing could result in death or serious

injury.

(000233a)

WARNING

Property or Equipment Damage. Tighten wheel lug

nuts after first 50 miles to factory specifications.

Failure to do so could result in death, serious injury,

property or equipment damage.

(000235)

WARNING

Property or equipment damage. Do not alter the trailer.

Alterations can damage essential safety items. Doing

so could result in death, serious injury, or property or

equipment damage.

(000285)

12 Owner’s Manual for Indirect Fired Heater

General Information

Driving a vehicle with a trailer in tow is different than driv-

ing the same vehicle without a trailer in tow. Consider the

following:

• It takes longer to get up to speed.

• More room is needed to turn and pass.

• More distance is needed to stop.

• The driver is responsible for keeping the vehicle

and trailer under control.

When towing, make regular stops to verify the following:

• Coupler is secured to the hitch and locked.

• Electrical connections are made.

• Appropriate slack in the safety chains and the

breakaway switch pull-pin cable.

• Tires are inflated to proper air pressure with no

damage or unusual wear to tread or sidewalls.

• Trailer doors are secured and latched.

Other towing guidelines:

• Use the tow vehicles mirrors to verify there is

enough room for lane changes or entering/exiting

traffic.

• Allow plenty of stopping distance for the trailer and

tow vehicle.

• Do not drive faster than the conditions allow.

• A rule of thumb for passing distance is the distance

with a trailer is four times the passing distance

without a trailer.

• Use lower gears for climbing and descending

grades.

• Do not ride the brakes while descending grades;

this can cause overheating and potential brake fail-

ure.

• Do not apply the tow vehicle brakes to correct ex-

treme trailer swaying. Continued pulling of the

trailer, and even slight acceleration, or carefully

applying the trailer brakes (using the electronic

brake controller) will provide a stabilizing force.

Wheel Chock Guidelines

•

Select wheel chock according to equipment type

and size.

• Always use in pairs and on firm surfaces.

• Chock in direction of grade.

• Chock both sides of wheel if direction of grade is

unknown.

• Use wheel chock only after parking brake is

applied and tested.

• Center chocks squarely against tread of each

wheel.

• Do not drive over wheel chocks.

Control Panel

The control panel is located in the front compartment of

the unit.

Figure 2-4. Control Panel Features

Personal injury. Do not operate unit during transport.

Doing so could result in death, serious injury, or

property damage.

(000231a)

WARNING

(000234a)

WARNING

Crushing hazard. Verify unit is properly secured and

on level ground. An unsecured unit can suddenly roll

or move, causing death or serious injury.

A Engine control box and ignition

B Fuel gauge

C Burner ON/OFF switch

D Blower START push button

E Blower STOP push button

F Blower ON indicator lamp

G Blower OFF indicator lamp

H Control panel main disconnect switch

008962

Owner’s Manual for Indirect Fired Heater 13

Operation

Section 3: Operation

Before Starting Engine

Pre-start Checklist

•

Remove all flammable materials and fire hazards

within 5 ft (1.5 m) of unit.

• Keep unit a minimum of 5 ft (1.5 m) from structures

or barricades.

• Verify the unit is not leaking fluids: inspect inside

and outside the unit for leaking fuel, engine oil,

HTF/hydraulic oil, and engine coolant.

• Verify the following are clear of debris and obstruc-

tions:

– Engine air intake

– Engine exhaust stack

– Outlets and fan intakes

• Verify air duct hose is securely fastened to outlet

duct assembly.

• Check fuel, engine oil, and engine coolant levels.

• Verify unit is properly secure with jacks deployed (if

applicable), wheels chocked, and level.

• Inspect the alternator drive belt for tension and

abnormalities.

• Verify that the burner cover is securely installed.

• Inspect the generator. See the generator manual.

• Verify battery cables are not loose or corroded.

• Inspect ducting for damage or unusual wear.

Engine Oil Level Check

NOTE: If engine was running, wait at least 10 minutes

before proceeding.

1. Remove oil dipstick from crankcase and wipe it

clean with a clean, lint free cloth.

2. Slowly insert the clean oil dipstick into the oil dip-

stick tube. Verify the oil dipstick is fully seated.

3. After 10 seconds, remove the oil dipstick and look

at the oil level on both sides. The lower of the two

readings will be the correct oil level measurement.

4. Add oil (if necessary) to adjust the level. After add-

ing or changing the oil, run the engine for one min-

ute before checking the oil level. Wait 10 minutes

to allow the engine to cool and oil to fully drain into

the oil pan.

Typical causes of inaccurate oil level readings:

• Reading the high level of the oil dipstick.

• Reading the oil dipstick before the oil fully drains

into the oil pan.

• Inserting and removing the oil dipstick too quickly.

• The oil dipstick is not fully seated in the oil dipstick

tube.

Engine Coolant Check

Inspect the coolant sub-tank to check the coolant level.

Check the coolant level when the engine is cold, as cool-

ant flows to the sub-tank when the radiator is still hot,

which provides an inaccurate reading. Replace the cool-

ant according to the Maintenance Schedule, or if it is

contaminated or dirty. See Adding Coolant.

Ducting Guidelines

• Place ducting in desired configuration before oper-

ating the unit.

• Tightly secure ducting end to the unit. Verify any

additional ducting is also tightly secured.

(000108)

WARNING

Hot Surfaces. When operating machine, do not

touch hot surfaces. Keep machine away from

combustibles during use. Hot surfaces could

result in severe burns or fire.

(000135)

CAUTION

Engine damage. Verify proper type and quantity of

engine oil prior to starting engine. Failure to do so

could result in engine damage.

(000154)

WARNING

Risk of burns. Do not open coolant system

until engine has completely cooled. Doing so

could result in serious injury.

Asphyxiation. Running engines produce

carbon monoxide, a colorless, odorless,

poisonous gas. Carbon monoxide, if not

avoided, will result in death or serious injury.

(000103)

DANGER

WARNING

Burn hazard. Do not remove ducting until all air

pressure has been emptied from hose duct.

Failure to do so could result in severe injury.

(000288)

14 Owner’s Manual for Indirect Fired Heater

Operation

• Avoid sharp bends or 90° turns in the ducting.

• Use only the necessary length of ducting required;

do not exceed maximum length.

• Verify that ducting is not in a high traffic area, and

will not impede workers or other machinery. Care

should be taken to prohibit the need to step or

climb over ducting.

• DO NOT place ducting over combustible materials.

• DO NOT place ducting over surfaces that may

cause damage or reduce performance, such as

water, sharp rocks or glass, electrical wiring, pip-

ing, etc.

• DO NOT place or drape anything over ducting,

such as covers, insulation (insulated ducting is

available), blankets or cloth, or electrical wires.

• Inspect ducting for damage or unusual wear before

each use.

Engine and Heater Startup

1. Turn ignition key to RUN and wait for the light to

expire.

2. Turn ignition key to START.

NOTE: Do not hold the engine starter key in the start

position for more than 15 seconds. Doing so will overheat

the starter motor. Wait 30 seconds for the starter motor to

cool before making a second attempt to start if the engine

fails to start.

3. Warm up engine for 90 seconds.

4. See Figure 3-1. Turn main disconnect switch to

ON.

Figure 3-1. Main Disconnect Switch

5. Press green START button.

6. Turn burner to ON.

7. See Ducting Guidelines. Place heating ducts as

appropriate for the application.

IMPORTANT NOTE: A twisted or bent air duct will

cause loss of air pressure and temperature.

NOTE: Do not use starting aids, such as gasoline. Doing

so will damage the engine.

Adjusting Heater Output

See Thermostat Control to adjust the setpoint (SP) and

differential (dIF). If SP is set to 180 °F (82 °C) and dIF is

set to 10 degrees, the following will happen:

1. Temperature will rise to 180 °F (82 °C).

2. Burner shuts off until temperature cools down 10

degrees.

3. Burner turns back on.

(000108)

WARNING

Hot Surfaces. When operating machine, do not

touch hot surfaces. Keep machine away from

combustibles during use. Hot surfaces could

result in severe burns or fire.

(000234a)

WARNING

Crushing hazard. Verify unit is properly secured and

on level ground. An unsecured unit can suddenly roll

or move, causing death or serious injury.

CAUTION

(000291)

Equipment damage. Do not attempt to start or operate

a unit in need of repair or scheduled maintenance.

Doing so could result in serious injury, death, or

equipment failure or damage.

WARNING

CAUTION

(000229)

Equipment or property damage. Do not block air

intake or restrict proper air flow. Doing so could

result in unsafe operation or damage to unit.

CAUTION

(000290)

Equipment damage. Do not cover unit during

operation. All ducting ports must remain open

even if not being used. Failure to do so will

result in equipment damage.

008974

OFF

Owner’s Manual for Indirect Fired Heater 15

Operation

Engine and Heater Shutdown

1. Turn burner switch to OFF.

2. Allow outlet air temperature to cool for at least 90

seconds.

IMPORTANT NOTE: Do not detach ducting until all air

pressure has been emptied from hose duct.

3. Press STOP.

4. Turn ignition key to OFF.

Thermostat

Figure 3-2. Thermostat Features

Changing Temperature Units

The thermostat is factory set to display temperature in

Fahrenheit. Press the up and down buttons simultane-

ously to convert to Celsius.

Thermostat Control

1. Press and hold the MENU button until the display

changes to flashing SP.

2. Press the up or down buttons to reach desired

function.

3. Press the MENU button to display current value of

function.

4. Press the up or down buttons until desired value is

reached.

5. Press the MENU button to save. The display will

return to the sensor temperature.

NOTE: If the MENU button is not pressed after changing

the setpoint value, the new value will not be saved.

See the table below for all thermostat functions.

A Temperature offset indicator

B Temperature units indicator

C Operating mode indicator

D Liquid Crystal Display (LCD)

E MENU button

F Output relay status indicator LED

G Down arrow button

H Up arrow button

CAUTION

(000295)

Equipment damage. Shut down the heater before

turning off the generator. Failure to do so could

result in equipment damage.

BIN

003820

Function Range

Factory

Setting

SP = Setpoint

-30 to 212 °F

(-34 to 100 °C)

diF = Differential 1 to 30 °F or C 5

ASd = Anti-short

Cycle Delay

0 to 12 minutes 1

OFS = Temperature

Offset

0 to 50 °F or C 0

SF = Sensor

Failure Operation

0 = output

de-energized

1 = output

energized

16 Owner’s Manual for Indirect Fired Heater

Operation

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Generac Power Systems MAC1.2G Owner's manual

Generac Power Systems MAC1.2G Owner's manual

Generac Power Systems MAC1.2G Owner's manual

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